Canada, US: Frequent disruptions due to winter weather likely across much of Canada and parts of the northern and western US through April 2024

Extreme winter weather events, including heavy snowfall, freezing temperatures, fog, and strong winds, are likely to impact transport and utility services across Canada and the northern tier and elevated areas of the western US during the winter months through at least the end of April 2024. Meteorological outlooks for the winter of 2023-24 indicate that temperatures will be slightly above average across much of the region over the coming months and precipitation levels are likely to be at or slightly below normal levels; however, widespread wintry precipitation and cold temperatures will still have significant impacts across the region over the winter months.

Conditions can vary greatly across the region depending on latitude and altitude, with winter weather systems also causing a rapid deterioration of conditions at times. The most severe winter conditions are likely in Alaska and northern parts of Canada, where frequent snowstorms and temperatures dropping to as low as -50 C (-58 F) make for an extremely inhospitable climate. Snow cover and temperatures dropping below freezing are also common across much of the rest of Canada and the northern US during winter, as well as mountainous areas of the western US. Winter storm systems can also cause more temporary but often severe disruptions across the affected area. The combination of heavy snowfall and strong winds can lead to blizzard conditions. Overland travel can be extremely hazardous due to snowfall accumulations and reduced visibility caused by blowing snow.

Airports across the affected area could experience frequent short-notice disruptions, leading to cancellations, delays, and even a full ground stop. Inclement weather can also lead to frequent blockages on arterial roads and significant transport disruptions can sometimes occur, particularly during the passing of intense winter storm systems. Avalanches can lead to protracted road blockages in mountainous areas. While authorities are experienced in minimizing the potential impact, roads in remote and mountainous regions may be disrupted more frequently and for extended periods due to their relative inaccessibility. Extreme temperatures may also increase the potential for vehicle breakdowns. Railways can experience disruptions, leading to the cancellation of services and long delays.

The cold weather can lead to utility disruptions where demand exceeds the capacity of local power supplies, and heavy snow or strong winds can damage utility infrastructure. Although normally affected areas are well equipped to deal with such problems, power outages can last for extended periods, particularly in remote locations.